Numbers 21:8

8And the Lord said to Moses, “Make a fiery serpent and set it on a pole, and everyone who is bitten, when he sees it, shall live.”

2 Kings 18:4

4 aHe removed the high places and broke the bpillars and cut down cthe Asherah. And he broke in pieces dthe bronze serpent that Moses had made, for until those days the people of Israel had made offerings to it (it was called Nehushtan).
 Nehushtan sounds like the Hebrew for both  bronze and  serpent
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